Datasheet

Section 14 Timer RD
Rev. 1.50 Sep. 18, 2007 Page 312 of 584
REJ09B0240-0150
14.4.3 Input Capture Function
The TRDCNT value can be transferred to GR on detection of the input edge of the input
capture/output compare pin (FTIOA, FTIOB, FTIOC, or FTIOD). Rising edge, falling edge, or
both edges can be selected as the detected edge. When the input capture function is used, the pulse
width or period can be measured.
Figure 14.19 shows an example of the input capture operation setting procedure.
[1] Designate GR as an input capture register
by means of TRDIOR, and select rising
edge, falling edge, or both edges as the
input edge of the input capture signal.
[2] Set the STR bit in TRDSTR to 1 to start the
TRDCNT counter operation.
[1]
Input selection
Select input edge of
input capture
[2]
Start counter operation
<Input capture operation>
Figure 14.19 Example of Input Capture Operation Setting Procedure